奇数：1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39.偶数：2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40.素数：2,3,5,7,11,13,17,19,23,29,31,37.和数：4,6,8,9,10,12,14,15,16,18,20,21,2...